Patents by Inventor Chang Choo

Chang Choo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus and method for cancelling wideband acoustic echo
    Patent number: 9025763
    Abstract: Disclosed is an apparatus and method for cancelling a wideband acoustic echo that controls a data flow of data that is transmitted and received using a central processing unit, and calculates data using a calculation processing unit configured to be distinct from the central processing unit.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: May 5, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: In Ki Hwang, Chang Choo
  • APPARATUS AND METHOD FOR CANCELLING WIDEBAND ACOUSTIC ECHO
    Publication number: 20130268267
    Abstract: Disclosed is an apparatus for cancelling a wideband acoustic echo, the apparatus including a determining unit to determine whether a monitor coefficient value obtained by dividing a Near-End Talker (NET) energy value by an ERROR energy value converges to an acoustic echo cancelling reference value.
    Type: Application
    Filed: April 5, 2013
    Publication date: October 10, 2013
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: In Ki HWANG, Chang CHOO, Byung Sun LEE
  • Apparatus and method for implementing efficient arithmetic circuits in programmable logic devices
    Publication number: 20060277240
    Abstract: Efficient implementation of arithmetic circuits in programmable logic devices by using Look-Up Tables (LUTs) to store pre-calculated values. A table look-up operation is performed in place of complex arithmetic operations. In this way, at the expense of a few LUTs, many logic elements can be saved. This approach is particularly applicable to circuits for calculating reciprocal values and circuits for performing normalized LMS algorithm.
    Type: Application
    Filed: August 16, 2006
    Publication date: December 7, 2006
    Inventors: Chang Choo, Asher Hazanchuk
  • Apparatus and method for implementing efficient arithmetic circuits in programmable logic devices
    Patent number: 7124161
    Abstract: Efficient implementation of arithmetic circuits in programmable logic devices by using Look-Up Tables (LUTs) to store pre-calculated values. A table look-up operation is performed in place of complex arithmetic operations. In this way, at the expense of a few LUTs, many logic elements can be saved. This approach is particularly applicable to circuits for calculating reciprocal values and circuits for performing normalized LMS algorithm.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: October 17, 2006
    Assignee: Altera Corporation
    Inventors: Chang Choo, Asher Hazanchuk
  • Apparatus and method for implementing efficient arithmetic circuits in programmable logic devices
    Patent number: 7058675
    Abstract: Efficient implementation of arithmetic circuits in programmable logic devices by using Look-Up Tables (LUTs) to store pre-calculated values. A table look-up operation is performed in place of complex arithmetic operations. In this way, at the expense of a few LUTs, many logic elements can be saved. This approach is particularly applicable to circuits for calculating reciprocal values and circuits for performing normalized LMS algorithm.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: June 6, 2006
    Assignee: Altera Corporation
    Inventors: Chang Choo, Asher Hazanchuk
  • Apparatus and method for implementing efficient arithmetic circuits in programmable logic devices
    Publication number: 20060053192
    Abstract: Efficient implementation of arithmetic circuits in programmable logic devices by using Look-Up Tables (LUTs) to store pre-calculated values. A table look-up operation is performed in place of complex arithmetic operations. In this way, at the expense of a few LUTs, many logic elements can be saved. This approach is particularly applicable to circuits for calculating reciprocal values and circuits for performing normalized LMS algorithm.
    Type: Application
    Filed: October 31, 2005
    Publication date: March 9, 2006
    Inventors: Chang Choo, Asher Hazanchuk